section.Earch section is sealed with O-ring,and the oil passage at the high pressure side is
section.Earch section is sealed with O-ring,and the oil passage at the high pressure side is
given a check valve.
given a check valve.
7.4 Operation of control valve
7.4 Operation of control valve
(1) Neutral position (See fig.7-2)
(1) Neutral position (See fig.7-2)
Fig.7.2 Neutral position
Fig.7.2 Neutral position
The oil discharged from the pump returns to the tank through the neutral passage.The
The oil discharged from the pump returns to the tank through the neutral passage.The
cylinder por
cylinder por
ts “A” and “B” are kept closed.
ts “A” and “B” are kept closed.
(6)
(6)
Pushing-in
Pushing-in
of p
of p
lunger
lunger
(See fig.
(See fig.
7-3)
7-3)
The neutra
The neutra
l passage is closed,an
l passage is closed,an
d the
d the
oil pushes up the
oil pushes up the
load check valve from the
load check valve from the
parallel feeder and flows to the cylinder port “B”. The returning oil from the cylinder
parallel feeder and flows to the cylinder port “B”. The returning oil from the cylinder
port”A” flows through the low-pressure passage to the
port”A” flows through the low-pressure passage to the
tank.The plunger is restored to
tank.The plunger is restored to
the neutral positio
the neutral positio
n by
n by
thr return spring.
thr return spring.
(7)
(7)
Drawing-out
Drawing-out
of
of
plunger(See
plunger(See
fig.7-4)
fig.7-4)
With the neutral passage closed,the oil pushes up
With the neutral passage closed,the oil pushes up
the load check valve from
the load check valve from
paralled
paralled
feeder and flows to the cylinde
feeder and flows to the cylinde
r port “A”. The returning oil from the cylinde
r port “A”. The returning oil from the cylinde
r port “B”
r port “B”
flows through the low-pressure passage to the tank. The plunger is restored to the neutral
flows through the low-pressure passage to the tank. The plunger is restored to the neutral
position by the return spring.
position by the return spring.
Core
Core
Low pressure passage
Low pressure passage
Neutral passage
Neutral passage
Return sping
Return sping
Cylinder port "A"
Cylinder port "A"
Parallel feeder
Parallel feeder
One-way valve
One-way valve
Cylinder port "B"
Cylinder port "B"
-88-
-88-
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